Include feature as part of the csproj copying (#3078)

Author: DrewScoggins

src/BenchmarkDotNet/Toolchains/CsProj/CsProjGenerator.cs

@@ -34,6 +34,7 @@ public class CsProjGenerator : DotNetCliGenerator, IEquatable<CsProjGenerator>
             "EnablePreviewFeatures",
             "RuntimeHostConfigurationOption",
             "WarningsAsErrors",
+            "Features",
         }.ToImmutableArray();
 
         public string RuntimeFrameworkVersion { get; }